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They are all closely dependant on each other so the absence of one will critically effect the activity of all others

However, in the past decade, multiple lines of scientific evidence challenged this traditional dichotomy

Given its wide-ranging benefits and central role in maintaining cellular health, understanding how glutathione works and the best ways to supplement it is crucial for those looking to optimise their health

A good example is a review published in 2003 in Endocrine Reviews , in which the authors note the importance of [growth hormone] and IGF systems in normal skin homeostasis. They specifically mention the role that growth hormone plays in collagen synthesis and the effect that IGF has on skin cell proliferation